高周波焼入れの疲れ強さに関する影響についての-実験 : その3

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  • An Experiment on the Effect of Induction Hardening of Fatigue Strength : Report 3
  • コウシュウハ ヤキイレ ノ ツカレ ツヨサ ニ カンスル エイキョウ ニ ツイテ ノ イチ ジッケン 3

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The authors have conducted fatigue tests on induction hardened V-notched specimens (ρ=0.25mm, 0.5mm, 1mm and 5mm) with C=0.13% steel. Induction-heating temperature was chosen 700°C, 800°C, 900°C, 1000°C, and 1100°C. The experimental results may be summarized as follows : (i) There is a favourable difference between σw1and σw2, when ρ is 0.25mm, 0.5mm, or 1mm; but no difference between σw1and σw2 at ρ=5mm. (ii) The absolute values of σw2 reach a maximum at 1100°C, and decrease as the heating temperature decrease. The value of σw1 at 1100°C is higher then that at the other temperatures, but the values of σw1 show no difference from those at other temperatures. The values of σw1 andσw2 are almost proportional to the hardness at the notched-bottom, within the range of these experiments. (iii) For discussion of the crack-development, we calculated the stress of crack-tip with simple form, and examined the simple relation between the calculated-stress and hardness.

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